Comments on "synthetic nitrogen fertilizers deplete soil nitrogen: a global dilemma for sustainable cereal production," by R.L. Mulvaney, s.a. Khan, and T.R. Ellsworth in the Journal of Environmental Quality 2009 38:2295-2314
J Environ Qual. 2010 Feb 19;39(2):749-52; author reply 753-6.
doi: 10.2134/jeq2010.0001le.
Print 2010 Mar-Apr.